Some quotes I'm planning to use someday

Neoclassical economic theory models "smart people in unbelievably simple situations," while the
real world is populated by "simple people [coping] with incredibly complex situations."
[Axel Leijonhufvud, quoted by Herbert Gintis]

Neal Stephenson is the Homer of geek mythology.
[review in San Diego Union-Tribune]

Quotes I've already used

Errors using inadequate data are much less than those using no data at all.
[Charles Babbage]

As far as the laws of mathematics refer to reality,
they are not certain; and as far as they are certain,
they do not refer to reality. [Einstein]

All models are wrong, but some are useful. [Box and Draper]

The human animal differs from the lesser primates in his passion for lists of "Ten Best".
[H. Allen Smith]

Action speaks louder than words -- but not nearly as often. [Mark Twain]

There is something fascinating about science. One gets such
wholesale returns of conjecture out of such a trifling investment
of fact. [Mark Twain]